Line a 15-in. x 10-in. x 1-in. pan with waxed paper; set aside. For praline crumbles, in a large saucepan over medium heat, combine the sugar, brown sugar, cream and butter. Cook and stir until sugar is dissolved. Stir in pecans.

Bring to a boil; cook and stir until a candy thermometer reads 238° (soft-ball stage), about 10 minutes. Remove from the heat. Add vanilla; stir for 2-3 minutes or until mixture thickens slightly and begins to lose its gloss. Quickly drop by heaping tablespoonfuls onto prepared pan. Let stand at room temperature until set. Coarsely chop.